1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
33 * $FreeBSD: releng/10.1/sys/i386/include/param.h 250338 2013-05-07 22:46:24Z attilio $
34 */
35
36
37 #ifndef _I386_INCLUDE_PARAM_H_
38 #define _I386_INCLUDE_PARAM_H_
39
40 #include <machine/_align.h>
41
42 /*
43 * Machine dependent constants for Intel 386.
44 */
45
46
47 #define __HAVE_ACPI
48 #define __HAVE_PIR
49 #define __PCI_REROUTE_INTERRUPT
50
51 #ifndef MACHINE
52 #define MACHINE "i386"
53 #endif
54 #ifndef MACHINE_ARCH
55 #define MACHINE_ARCH "i386"
56 #endif
57 #define MID_MACHINE MID_I386
58
59 #if defined(SMP) || defined(KLD_MODULE)
60 #ifndef MAXCPU
61 #define MAXCPU 32
62 #endif
63 #else
64 #define MAXCPU 1
65 #endif /* SMP || KLD_MODULE */
66
67 #ifndef MAXMEMDOM
68 #define MAXMEMDOM 1
69 #endif
70
71 #define ALIGNBYTES _ALIGNBYTES
72 #define ALIGN(p) _ALIGN(p)
73 /*
74 * ALIGNED_POINTER is a boolean macro that checks whether an address
75 * is valid to fetch data elements of type t from on this architecture.
76 * This does not reflect the optimal alignment, just the possibility
77 * (within reasonable limits).
78 */
79 #define ALIGNED_POINTER(p, t) 1
80
81 /*
82 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
83 * architecture. It should be used with appropriate caution.
84 */
85 #define CACHE_LINE_SHIFT 7
86 #define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT)
87
88 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
89 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
90 #define PAGE_MASK (PAGE_SIZE-1)
91 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
92
93 #ifdef PAE
94 #define NPGPTD 4
95 #define PDRSHIFT 21 /* LOG2(NBPDR) */
96 #define NPGPTD_SHIFT 9
97 #else
98 #define NPGPTD 1
99 #define PDRSHIFT 22 /* LOG2(NBPDR) */
100 #define NPGPTD_SHIFT 10
101 #endif
102
103 #define NBPTD (NPGPTD<<PAGE_SHIFT)
104 #define NPDEPTD (NBPTD/(sizeof (pd_entry_t)))
105 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
106 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
107 #define PDRMASK (NBPDR-1)
108
109 #define MAXPAGESIZES 2 /* maximum number of supported page sizes */
110
111 #define IOPAGES 2 /* pages of i/o permission bitmap */
112
113 #ifndef KSTACK_PAGES
114 #define KSTACK_PAGES 2 /* Includes pcb! */
115 #endif
116 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
117
118 /*
119 * Ceiling on amount of swblock kva space, can be changed via
120 * the kern.maxswzone /boot/loader.conf variable.
121 *
122 * 276 is sizeof(struct swblock), but we do not always have a definition
123 * in scope for struct swblock, so we have to hardcode it. Each struct
124 * swblock holds metadata for 32 pages, so in theory, this is enough for
125 * 16 GB of swap. In practice, however, the usable amount is considerably
126 * lower due to fragmentation.
127 */
128 #ifndef VM_SWZONE_SIZE_MAX
129 #define VM_SWZONE_SIZE_MAX (276 * 128 * 1024)
130 #endif
131
132 /*
133 * Ceiling on size of buffer cache (really only effects write queueing,
134 * the VM page cache is not effected), can be changed via
135 * the kern.maxbcache /boot/loader.conf variable.
136 *
137 * The value is equal to the size of the auto-tuned buffer map for
138 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
139 */
140 #ifndef VM_BCACHE_SIZE_MAX
141 #define VM_BCACHE_SIZE_MAX (7224 * 16 * 1024)
142 #endif
143
144 /*
145 * Mach derived conversion macros
146 */
147 #define trunc_page(x) ((x) & ~PAGE_MASK)
148 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
149 #define trunc_4mpage(x) ((x) & ~PDRMASK)
150 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
151
152 #define atop(x) ((x) >> PAGE_SHIFT)
153 #define ptoa(x) ((x) << PAGE_SHIFT)
154
155 #define i386_btop(x) ((x) >> PAGE_SHIFT)
156 #define i386_ptob(x) ((x) << PAGE_SHIFT)
157
158 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
159
160 #endif /* !_I386_INCLUDE_PARAM_H_ */
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